Yes,it can. My friends got hacked yesterday by a hacker. They said that their computer were infected by a malware where the hacker can easily access your pc without your knowledge and consent. From that point on,he can start his plan to search for private information saved from notepads and documents where you've put your passcode keys from your wallets and then steal your holdings.
I just feel bad about it. It shoud've been avoided if they never put any important information about their walletts from their computers. They should've stored that information somewhere else like wrote it in a paper or notebook then hid it where you alone can know about its whereabouts and if you want to be sure that it is totally safe,you could just memorize it. That is the safest way to avoid hackers stealing from you.
Beware of Phishing sites too. Make sure you got the spelling correctly when logging in to your wallet site.